T6 Application: What a Tenant Can Do When the Landlord Won't Repair

Mould in the bathroom, a furnace that keeps failing, a leak that returns after each patch: when you have told your landlord and nothing happens, it is hard to know what comes next.

In Ontario, the Landlord and Tenant Board (LTB) hears these disputes through the T6 application. This article explains who can use it, what the form asks, what evidence helps, and what the LTB can order.

What is a T6 application?

A T6 is the form a tenant uses when the landlord does not fix a reported maintenance problem, fixes it improperly or is too slow. A current tenant or a former tenant can apply.

There is a time limit when the problem has already been fixed. In that case the T6 must be filed within one year of the fix. Whether another time limit applies when the problem is ongoing is worth confirming with a lawyer or the LTB.

The fee is $53, or $48 if filed through the Portal. A T6 is refused if the form or the fee is missing, and a fee waiver is available.

What the form asks you to explain

The T6 asks you to describe the problem, give exact or approximate dates, and say when the landlord was first told. It also asks how you calculated any money claim.

The LTB updated its forms and processes effective September 21, 2026. Use the current version of the form when you file.

Evidence that helps

Because the form asks when the landlord was first told and how you calculated your claim, your records matter. Clear, dated evidence makes your account easier to follow.

• Written repair requests and any replies, with dates.
• Dated photos and videos showing the problem and how it changes over time.
• A timeline of events: when it began, each report, each visit.
• Receipts for out-of-pocket costs, such as repairs, hotel stays, or replacing damaged belongings.
• Notes on how the problem affects your daily life, such as lost use of a room.
• Statements from anyone who saw the problem, and any inspection reports.

If you are claiming money, show your math: what you paid, what you lost, and how you arrived at each number.

What can the LTB order?

There are nine remedies in total, and the most the LTB can order on the claims is $50,000. Which ones apply depends on your facts.

Other issues to know about

A landlord cannot shut off or interfere with heat (September 1 to June 15), electricity, fuel, or hot or cold water. If that is what is happening, rather than a slow repair, mention it when you get advice, because other options may apply.

For arrears applications filed on or after September 21, 2026, a tenant who wants to raise other issues, such as maintenance, at an arrears hearing must pay the landlord at least half the claimed arrears at least seven days before the hearing. If you are facing an arrears application and also have repair problems, get advice early.

What to do next

• Report the problem to the landlord in writing, and keep a copy.
• Photograph and date the problem now, and keep doing so.
• Start a timeline and an expense list.
• Check whether the problem has been fixed, because that starts the one-year clock.
• Gather the T6 information: description, dates, when the landlord was told, and how any claim is calculated.
• Decide on the fee or a fee waiver request, and file the current form.

If you are unsure about the remedies to ask for, or you also have a rent or eviction issue in play, speak to a lawyer or legal clinic before you file.

Frequently asked questions